James howard and edward tenneybousfield



-J. HOWARD 8v E. T. BOUSPIELD.

.STEAM GENERATOR.

Na. 81,638. Patented sept. 1, 1868.

lIll In' l INI , @anni 'time stent 'ffmf Letters Patent No. 81,638, dated Septembernl, 1868. y

IMPEDVENENE 1N srEAu-eENEEAToEs.

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'ro ALL, WHoM 1T MAY ooNcEEN:

Bc it known that we, Janus Howsnn andEDwAnD TENNEY BoUsmEnD, of Bedford, in the county of Bedford, England, have invented -a new-and useful Improvementin Steam-Boilers; and we'do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in-tlie art to make and use the same, reference being had to the accompanying drawingsfforxning part of this speciication, in which-l Figure 1 represents 'a side elevationof our improved boiler with a partial section, the side wall of the furnace being removed.

Figure 2 represents a partialfront elevation and cross-section.

Figure 3 represents a top view. I

Figures 4 and 5, detached sectional viowsof thosections.

Similar letters of reference indicate like parts.

The nature of our invention relates to' improvements in steam-boilers, whereby it is' intended v-to improve. the construction and inox-caso the eiiiciclney of the sam-e.

Allitherto, in manufacturing our improved boilers, we have placed the several sections of tubes`transversely of the furnace, andwe have connected the bottom horizontal tube of each section with a feed-wa ter pipe commen i to all.l These connections werefmade underneath the bottom horizontal tubes, the ends of-which were closed ceord'ing to our present invention, in order to aiord increased facility4 for removing' calcareous or Vother deposits from the bottoms of the sections, and also to adapt the boiler to confined'positions, as, for example, when the front of the furnace only can be approached, we `propose to placethe sections longitudinally. of the furnace and heating-chamber, and to gain access tothe lower horizontal tubes of the sections through their front ends. l f I i v Another part'of our invention has for its object tofincrea-se the eiiicie'ncy of the inner circulating tubes, and incidentally to allow of the clearing out of the horizontal tubes, as above explained. l

Heretofore we have formed these tubes with open ends, and cut vertically wedge-shaped or point-ed slits through the ends, to provide for the circulation of the water. u

By this arrangement, however, the upward and downward currents somewhat interfered-with euch other, and as these internal tubes rest on 'the bottoms of the sections, theywoulcl eil'ectually prevent the introduction ci' the scraper, as above described.

'To remedy these defects, we propose to suspend the inner tubes clear of the bottom of the sections by tting them with wing-pieces which will restnpon the shoulders of the couplings of the longitudinal tubes. We also close, or nearly so, the bottom of' the pondent inner tubes, bringing theuJ'to the form of Van inverted cone, and just above the cone we make lateral openings in the tubes, so that the descending water may ow through the same. A

In order to utilize, as far as may bcthc heat of thc gases ot lcombustion, before tney escape into the chimney, we set in the liuc leading to the chimney a group of short sections, through which we cause the feedwater to circulate on its passage to the larger sections or boiler proper. These short sections are fitted with internal circulating-pipes.

On reference to the accompanying drawings, A represents the lower horizontal tubes,B the vertical tubes, and C the upperl horizontal tubes of the several groups, which are arranged, with reference to the'furnace, so as to present the ends of the horizontal tubes towards the iront'; the front ends ofthe tubes A being supported on a plate or bracket, C', projcctinginward from the front wall, and the rear ends may be suspended from a bar secured tov the upper side of the bottoni tubes, or from a .bar passing through the same, or, as-shown in the drawings, `by e; perforated wall, D, oi {hebt-ich', which will allow of the current of heated gases passing out of the fire-chamber,l with a view of being returned to act upon the upper'part ofthe boiler.

Across the front'ends of the lower,v longitudinal tubes of all the sections, a feed-waterl pipe, D, passes, having openings on one side corresponding withthe openings in the ends of the lower horizontal tubes of the sections, and recesses for receiving the ends of short tubes u, connecting the ends of the said horizontal tubes with the tube D. 0n the opposite side the feed-water pipe, and coinciding with these openings, are other like openings, which are closed by the lids or bonnets f. This arrangement admits, by simply removing the bonnets. of the introduction of a scraper', to remove any deposit that may form on the pottom of the tubes A.

` In'cnsesfwhere it is desirable to increase the water-space in the lower horizontal tubes, we propose to make themoi' suilicientdiamcter to receive two or more rows of the vertical tubes, instead of one row, as is shown inl iig. 4, and inorder to increase the surface of the water at the water-line, and thus to diminish the variation of the, height of the water-level, we propose to swell out the vertical tubes at that point in a. spherical form, es shown iniig. 5. In a 'line with the horizontal axis of these spheres, we divide the furnace into upper and lower chambers by a dividing-plate, E, and the llame and heated gases, after passing out of the lower chambers intov the space between thefront plated? and the tubes, we turn into the upper partofthe sections of the boiler.'

Instead of resting the lower ends of the inner circulating-tubes on the bottom of the lower horizontal tubes,

-as heretofore, we propose to suspend themclearioi the bottoms of the said tubes by fitting them with wingpieces e, as shown in iig. 4, which will rest upon the shoulders oi' the couplings of the vertical tubes with the horizontal tubes. `We also close, or nearly so, the bottom ends of the pendent inner tubes, bringing them to the form oi an inverted cone, and just above the'cone we make lateral openings d in the tubes, so that the descending-water may Bow through the same. The form of the inverted.k cono which we adopt o'ers the least resistance to the upward iow of the heated water.

In .order to facilitate the iixingof the liuc-division plate and the top-covering plates in cases where the top of the boiler is not accessible, we propose to connect the top and division-plates together, and iit them to the sections before putting the sections in place. p

By this arrangement, when the sections are set side by side in the furnace, the tlues will be complete.

G represents a series of short sections of vertical and longitudinal tubes, also provided with internal circulating-tubes, which are set` in the due leading to the chimney, through which we cause the feed-water to circulate on its passage to the larger sections of the boiler.` proper, in order to utilize, as far as may he, the heat of the gases of combustion before they escape.

g represents a feeding-tube, and h a tube connecting the heating'sections with. the feed-water tube-D connecting with the sections A in front. y

Having thus described our invention, we claim as new, and desire to secure by Letters Patent-c 1. The construction andiarrangement oi' the vertical tubes B and'their inner tubes with the horizontal tubes or pipes' C and A, whereby access is gained to the pipes A through the feed-pipe, as above explained, for cleaning the boiler.

'2. The construction of the horizontal pipes A, arranged'with the feed-pipe, having covered openings, whereby to gain access to the interior of the boiler, for cleaning o ut the same.

3. The internal tubes, constructed with lateral openings at bottom, as described, whereby to keep up the circulation of the water in the boiler, and the arrangsmentof the tubes, as described.

4. The heatingsections G for heating the' feed-water, arranged in combination with the larger boileraections, substantially as and for the purpose described.

The above specitication of our invention signed by us, this 10th day of April, 1868.

JAMES HOWARD, EDWARD vTENIIEY BOUSFIELD.

Witnesses Josnua N UNH, Deputy Uonaul,} D. s' BAKKER clerk UenculateU. iS. A., London. 

